386 CLAYS AND CLAY INDUSTRY. 



of water to a plastic mass whose air shrinkage was 9 per cent. 

 The average tensile strength was 127 pounds per square inch. In 

 burning it gave the following results : 



Burning test of sample from northwest of Moorestown (hoc. 128). 



Cone 05 1 



Fire shrinkage, 1.3 % 8 % 



Absorption, 17.89% 485% 



Color, light red light red 



Condition, not steel-hard steel-hard 



This shows too high a fire shrinkage for use alone. 



On the road to Parry, 1 mile due north of the preced- 

 ing locality, and 2 miles northwest of Moorestown, there is 

 another exposure of Clay Marl II (Loc. 129). Here a. boring 

 was made to a depth of 6 feet that showed 5 feet of chocolate clay 

 with a little yellow mottling and 1 foot of sandy marl. The clay 

 is denser than at locality 128, somewhat more sandy, and is prob- 

 ably a lower-lying bed. The boring showed no water, and there 

 is little overburden. Black sand is said to occur at a depth of 20 

 feet. Physically the clay (Lab. No. 608) is not very unlike that 

 from Loc. 128, although it took less water to mix it up, viz., 29.02 

 per cent. Its air shrinkage was 8.8 per cent. In burning it showed 

 the following : 



Burning test of a clay from two miles northwest of Moorestozvn (Loc. I2q). 

 Cone 05 03 1 



Fire shrinkage, 1.2 % 1.2 % 4.2 % 



Absorption, 16.34% 16.41% 9-95% 



Color, light red light red red 



Condition, not steel-hard not steel-hard steel-hard 



It would probably have to be burned to cone 01 or 1 to make a 

 good, hard brick. 



A similar bed of clay outcrops about one-fourth mile northeast 

 of the previous locality at Loc. 130, and has but little overburden. 



Wilson's station. — Along the North Branch of Pensauken creek 

 rjoth Clay Marl I and II are exposed on the south side of the creek, 

 one-half mile south of Wilson's station (Loc. 151). A boring of 

 8 feet was made in the deposit, mostly in Clay Marl II, but the 



